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	<div id="winchm_template_title">Bug Check 0x76: PROCESS_HAS_LOCKED_PAGES</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The PROCESS_HAS_LOCKED_PAGES bug check has a value of 0x00000076. This bug check indicates that a driver failed to release locked pages after an I/O operation, or that it attempted to unlock pages that were already unlocked.</p>
<p>
<div class="alert"><b>Important </b>This topic is for programmers. If you are a customer who has received a blue screen error code while using your computer, see 
            <a href="http://windows.microsoft.com/en-us/windows-10/troubleshoot-blue-screen-errors" xmlns:loc="http://microsoft.com/wdcml/l10n">Troubleshoot blue screen errors</a>.</div>
</p>
<h2> PROCESS_HAS_LOCKED_PAGES Parameters</h2>
<p>The following parameters appear on the blue screen.</p>
<table>
<tr>
<th>Parameter 1</th>
<th>Parameter 2</th>
<th>Parameter 3</th>
<th>Parameter 4</th>
<th>Cause of error</th>
</tr>
<tr>
<td>
<p>0x00</p>
</td>
<td>
<p>The pointer to the process object</p>
</td>
<td>
<p>The number of locked pages</p>
</td>
<td>
<p>The pointer to driver stacks (if they are enabled). Otherwise, this parameter is zero.</p>
</td>
<td>
<p>The process being terminated has locked memory pages. The driver must unlock any memory that it might have locked in a process, before the process terminates. </p>
</td>
</tr>
<tr>
<td>
<p>0x01</p>
</td>
<td>
<p>MDL specified by the driver</p>
</td>
<td>
<p>Current number of locked memory pages in that process</p>
</td>
<td>
<p>A pointer to driver stacks for that process (if they are enabled). Otherwise, this parameter is zero.</p>
</td>
<td>
<p>The driver is attempting to unlock process memory pages that are not locked.</p>
</td>
</tr>
</table>
<p> </p>
<h2>Cause</h2>
<p>The driver either failed to unlock pages that it locked (parameter 1 value is 0x0), or the driver is attempting to unlock pages that have not been locked or that have already been unlocked (parameter 1 value is 0x1).</p>
<h2>Resolution</h2>
<p><b>If the parameter 1 value is 0x0
   </b></p>
<p>First use the <a href="#Bookmark2432"><b>!search</b></a> extension on the current process pointer throughout all of physical memory.  This extension might find at least one memory descriptor list (MDL) that points to the current process.  Next, use <b>!search</b> on each MDL that you find to obtain the I/O request packet (IRP) that points to the current process. From this IRP, you can identify which driver is leaking the pages.</p>
<p>Otherwise, you can detect which driver caused the error by editing the registry: </p>
<ol>
<li>
<p>In the <b>\\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management</b> registry key, create or edit the <b>TrackLockedPages</b> value, and then set it equal to DWORD 1. </p>
</li>
<li>
<p>Restart the computer. </p>
</li>
</ol>
<p>The system then saves stack traces, so you can easily identify the driver that caused the problem. If the driver causes the same error again, <a href="#Bookmark1767"><b>bug check 0xCB</b></a> (DRIVER_LEFT_LOCKED_PAGES_IN_PROCESS) is issued, and the name of the driver that causes this error is displayed on the blue screen and stored in memory at the location (PUNICODE_STRING) <b>KiBugCheckDriver</b>.</p>
<p><b> If the parameter 1 value is 0x1
   </b></p>
<p>Examine the driver source code that locks and unlocks memory, and try to locate an instance where memory is unlocked without first being locked.</p></div></div>	
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